Process of treating sulfite, ground wood, or other paper-stock.



No. 735,444. PATENTED AUG. 4, 1903.

J. H. BAKER.

PROCESS OF TREATING SULEITE, GROUND WOOD, OR OTHER PAPER STOCKT APPLICATION FILED MAY 2, 1902.

no MODEL. 2 SHEETS-SHEET 1.

m: ucnms PETERS c0 morcyuwov. wnsumamn. u. c.

2 SHEETS-SHEET 2.

PATENTED AUG. 4, 1903.

II III J. H. BAKER.

APPLIOATION FILED MAY 2, 1902.

' llllllllll m: NORRIS PETERS c0. wow-umq. wAsnmG'fOm n. 0.

PROCESS OF TREATING SULFITE, GROUND WOOD, OR OTHER PAPER STOCK.

NO MODEL.

No. 735,444. UNITED" STATES Patented August a, 1903.

PATENT OFFIcE.

JAMES H. BAKER, OF SARATOGA SPRINGS, NEW YORK, ASSIGNOR TO BAKER AND 'SHEVLIN COMPANY, OF SARATOGA SPRINGS, NEW YORK, A COR- PORATION OF NEW YORK.

PROCESS OF TREATING SULFITE, GROUND WOOD, OR OTHER PAPER-STOCK.

srEcIrIoA'rIoN forming part of Letters Patent No. 735,444, dated August 4, 1903.

. Application filed May 2. 1902.; Serial No- 105.536. (No specimens.)

To all whom it may concern: I

Be it known that I, J AMES H. BAKER, a citi-' zen of the United States, residing at Saratoga Springs, in the county of Saratoga and State of New York, have invented an Improved;

Process of Treating Sulfite, Ground Wood, or

other Paper-Stock, of which the following is a specification.

My invention relates to an economical, IO quick, and continuous method or process of screening and treating sulfite, ground wood,

good stock that there is in the pulp.

Heretofore various methods or'processes of treating and screening sulfite,""ground wood,

or other paper-stock have been employed but the same have been attendedwith some" difficulties or loss of time or lack of economy The object of my invention is to'overcome' these difiiculties as faras possible." In the process or method employed by me the supply of pulp carrying the fiber and a supply of water to reduce the consistency thereof are each regulateda'nd delivered into.

a suitable mixing-chamber or'flow-box, from which the materialsfpass to a centrifugal device, in which suchmaterial is rapidly and forcefully agitated and thrown against screen-plates, which separate the good stock from the slivers, the good stock passing through the screen-plates into a receptacle and being delivered from one side thereof and the slivers remaining 'on'the opposite side of the screen-plates and received intofa receptacle, from which they are delivered." In this part of the process a cleaning device i is occasionally made use of, and 'a water spraying device is also occasionally made use of for cleaning thescreen-plateaso as to 4 keep the apertures therein free and clear for use, and a part of the method consists in passing currents of air through the centrifugal device to facilitate the action thereof and assist in the separation of the fibers from the pulp more perfectly than heretofore. These currents of air are created-by thecentrifugal devices themselves, and to insure the action of these currents of air the machine is so constructed as to provide an exit for the air be- 5o yond the location of the screen-plates, and

which device is adapted for conjoint action with the cleaning device for spraying the plates. The action of the centrifugal devices draws in the air and forces the same against through openings provided in the cover of the centrifugal device. The action of the air is to segregate and separate the pulp into or other paper-stock, so as to recover all of theminuteportions and to force thefiber through the screen-plates, where the same is collected in receptacles providedtherefor. The good stock orfiber is delivered from the recepta- 6 cles containing the same into a suitable recep tacle outside of the centrifugal device and from there by a pipe into a suitable pulpvat in which vat is a couch-roller for gathering the pulp. From this roller the pulp-is 7o delivered upon an endless felt belt forming part of a machine known as a wet machine and by said belt to a roller of the machine, on which said pulp is collected and is put under pressure as the same accumulates. Meanwhile in the process the slivers areldelivered from the receptacle receiving the same and preferably mixed with an additional supply of water to give the same a good wash, and from there the slivers or tailings pass into a diaphragm-screen and are therein subjected to agitation, which causes a final and more perfect separation of the particles, so that any good stock remaining or that may becaught or availed of is delivered through said screen in one direction and the slivers or waste stock delivered by a suitable devicefrom the machine in a different direction.

I have discovered that in carrying out this method and in the employment of suitable machines therefor one centrifugal machine is adapted for preparing the materialsfor several wet-machines and several diaphragmscreen machines, so that'these latter machines 5 may be arranged in groups.

In the drawings I have represented, in Figures 1 and 2, disconnected diagrammatic elevations of a centrifugal pulp-screen, a wet-machine, and a diaphragm-screen machine, and ice.

the connected supporting and cooperating parts suitable for the carrying out of my improved process; and Fig. 3 is a vertical section through the improved form of centrifugal-screen forming part of the device employed by me in carrying out the present process.

The apparatus preferred by me in the carrying out of the improved process described herein comprises a centrifugal pulp-screen a, similar to the devices shown and described in Letters Patent No. 686,962, of November 19, 1901, and Nol 693,215, of February 11, 1902.

a is a pulley mounted on a shaft, and a a belt on an adjacent pulley for imparting rotation to the centrifugal device.

1) represents a wet-machine similar to that described and illustrated in Letters Patent No. 639,882, granted December 26, 1899, and 0 represents a diaphragm or tailings screen, which may be of any good construction, but preferably is substantially the same as that shown and described in Letters Patent No. 682,839, granted September 17, 1901.

Referring to the drawings, 2 is a pipe for Water, and 3 a valve for regulating or gaging the supply thereof. at is a pipe for paperstock, and 5 a valve for regulating or gaging the supply thereof. The water and the paper-stock are delivered from these pipes into a vat 6, where they are mixed, and from this vat the materials are delivered past an adjustable gate 7 into pipes 8 8 to the centrifugal machine. In the centrifugal machine the rapidly-rotating devices take up the material and force it against the perforated screenplates is, the good fiber or stock passing through the, perforations of the screen-plates to the outside and between the same and the outer casing Z, and the slivers or tailings remain on the inside of the screen-plates, the

- good stock falling into the trough g and the tailing or slivers into the trough h.

The rapid rotation of the centrifugal devices sets up currents of air of force, projecting the same against the screenplates, the action of which is to assist the screening operation in insuring the passage of the good stock of fibers through the screen-plates, and to insure this action and provide a vent or escape for the pent-up air between the screenplates and the outer casing removable perforated gratings e are employed in the top of the machine.

In the screening operation it is essential that periodicallythe screen-plates be cleansed, and for this purpose a cleaning device din a ring-like form and bearing against the inner surface of the screen-plates and actuated by rods extending outside of the machine is employed. This device may be moved from its uppermost normal position of rest down to the lower edge of the screen-plates in removing the slivers from the surface, and a waterspraying device 9, controlled by hand, may be inserted through the openings in the top of the machine upon the removal of the perforated gratings e, so as to force water against the outer surface of the screen-plates to wash down the good stock or fibers and cleanse the perforations, forcing any materials that may be in the openings of the screen-plates into the machine and down into the sliver-trough.

The supply-trough 10 receives the good stock from the trough g of the centrifugal device, delivers the same through the pipe 11 to the pulp-vat 12, forming a storage device thereof for one or more Wet-machines b. In this pulp-vat there are one or more couchrollers 13 for taking up the pulp as rotated and delivering the same upon the felt belt 14 of the wet-machine, upon which belt the paper-stock fiber is conveyed to the roller 15. The felt belt 14 passes around a roller below the roller 15, but the upper roller gathers the pulp upon it,.and pressure exists between the two rollers while the pulp gathers, and periodically this pulp is removed from the roller 15 in the usual manner.

The slivers from the trough h are preferably mixed with a supply of water to provide a good wash, and the water so mixed may come from one or two sources. The hollow base f of the centrifugal machine is to be filled with water for cooling purposes, the same being supplied by a pipe f. Said water is conveyed away fromthe hollow base by a pipe f that enters the sliver-trough, so that the water employed for cooling purposes is also mixed, as a part of the process, with the slivers in the sliver-trough h. The slivers or tailings pass from the trough h into a discharge-trough 16, and in cases-where the water employed for cooling the hollow base of the machine is not passed into the sliver-trough a pipe 17 may enter the discharge-trough 16 to mix a regulatable quantity of water with the slivers or tailings, so as to reduce the consistency of said slivers or tailings for the after action of one or more diaphragm-screen devices 0.

I prefer to add to the diaphragm-screen structure shown and described in Patent No. 682,839, of September 17, 1901, endless-chains 18, passing around sprockets upon shafts 2O 20 at opposite ends of the machine, and to connect to these chains scraper-blades 19, of any desired construction, and to revolve these shafts, sprocket-wheels, and chains bya shaft 21, having a worm-Wheel engaging a pinion on the shaft 20, and a pulley engaged by a belt 22, passing around the main pulley-shaft 23. The'action of this device is to cause the scraper-blades 19 to pass through the machine in one direction immediately above the plates 0' of the diaphragm-screen and remove from the machine at one end the tailings or slivers progressively, permitting a thorough action of said plates upon the mass to remove therefrom any good fiber or stock in recovering the same. This good stock is taken care of as provided for in the Patent No. 682,839.

In carrying out my method or process by the devices hereinbefore described the paperstock or similar material to be treated is properly diluted, regulated,agitated, separated, and thereafter treated for the utilization of the good stock, and further treated for the final separation of any good stock from the slivers or tailings, all in a thoroughly quick and efiicient manner andin maximum quantities to an extent and thoroughness not heretofore attained.

I claim as my invention- 1. The process herein described of treating su-lfite, ground wood or other paper-stock for the separation and recovery of the good fibers from the tailings or slivers and formation of the same into sheets, consisting in mixing regulatable and predetermined quantities of paper-stock and water, agitating the mass and separating the good fibers from the slivers, mixing water with the slivers or tailings to reduce the consistency thereof, agitating the mass and separating therefrom any remaining good fibers and conveying away and forming the good fibers into a compressed sheet.

2. The process herein described of treating sulfite, ground wood or other paper-stock for the separation and recovery of the good fibers from the tailings or slivers and theformation of the same into sheets, consistingin mixing regulatable quantities of paperstock and water, agitating the mass and separating the good fibers from the slivers, and simultaneously causing forceful currents of air to act upon the mass in its agitated condition to assist in the separation of the particles, mixing Water with the slivers or tailings to reduce the consistency thereof, agitating the mass and separating therefrom any remaining good fibers and thereafter forming the good fibers into a compressed sheet.

3. The process herein described of treating sulfite, ground Wood or other paper-stock for the separation and recovery of the good fibers from the tailings or slivers and formation of the same into sheets, consisting in mixing regulatable quantities of paper-stock and Water, agitating the mass and separating the good fibers from the slivers and periodically employing jets of water for assisting a continuous operation and during the separation of the good fibers from the slivers, mixing Water with the slivers or tailings to reduce the consistency thereof, agitating the mass and separating therefrom any remaining good fibers and conveying away and forming the good fibers into a compressed sheet.

4. The process herein described of treating sulfite, ground wood or other paper-stock for the separation and recovery of the good fibers from the tailings or slivers and formation of the same into sheets, consisting in mixing regulatable quantities of paper-stock and water, agitating the mass and separating the good fibers from the slivers, simultaneously causing forceful currents of air to act upon the mass in its agitated condition to assist in the separation of the particles and periodically employing jets of water for assisting a continuous operation and during the sep aration of the good fibers from the slivers, mixing water with the slivers or tailings to reduce the consistency thereof, agitating the mass and separating therefrom any remainin g good fibers and conveying away and forming the good fibers into a compressed sheet.

Signed by me this 26th day of April, 1902.

JAMES H. BAKER.

Witnesses:

WILLIAM J. DELANEY, BEATRICE G. FARRINGTON. 

